Interaction of laser radiation with matter. Laser plasma

Action of the 216-nm fifth harmonic of a Nd:YAP laser on photosensitive germanosilicate glass films

S. V. Murav'ev^a, O. A. Malshakova^a, K. M. Golant^b, A. N. Denisov^b, V. M. Mashinsky^b, O. D. Sazhin<sup>b

a</sup> Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod
^b Fiber Optics Research Center of the Russian Academy of Sciences, Moscow

Abstract: The absorption spectrum, refractive index, and relief of the surface of a germanosilicate glass film are studied upon the non-destructive action of the 216-nm (5.75-eV) fifth harmonic of a repetitively pulsed Nd:YAP laser. It is shown that laser irradiation of films induces a strong photorefractive effect despite the relatively low absorption coefficient. For the 100-mJ cm^-2 energy density and above, two-photon process make a noticeable contribution to the absorption of laser radiation at 216 nm. The diffraction efficiency of photoinduced phase gratings achieved ~7 × 10^-3 for the exposure dose ~6 kJ cm^-2, which corresponds to the induced refractive index 1.5 × 10^-3. At higher exposure doses, a relief appears on a film surface and the diffraction efficiency of a phase grating is reduced.

PACS: 42.55.Rz, 42.65.Ky, 42.70.Gi, 42.70.Nq

Received: 20.01.2003

 English version: Quantum Electronics, 2003, 33:11, 953–957

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